PRESENCE DETECTION SYSTEM, PRESENCE DETECTION METHOD, AND PROGRAM

摘要

A presence detection system is equipped with a transmitter that transmits a multipath wireless signal and a receiver that detects the presence of a person by receiving the transmitted wireless signal, within a prescribed space. On the basis of the reception level for a wireless signal received intermittently in a first interval, the receiver determines whether there has been a change in the present/absent state of a person (step S102). When it is determined that there has been a change in the present/absent state of a person, the receiver determines whether a person is present/absent on the basis of variation in the reception level for a wireless signal received in a second interval, which is shorter than the first interval (step S108).